<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试操作</title>
</head>
<body>

<section id="test-sec"></section>

<script type="text/javascript" src="../../script/jquery-3.2.1.js"></script>
<script type="text/javascript">
    $(() => {
        let testSec = $("#test-sec");
        console.log($.type(testSec));
        console.log($.isArray([1, 2, 3]));
        console.log($.isFunction(() => {
        }));
        console.log($.isEmptyObject(null));
        console.log($.contains($("body")[0], testSec[0]));
        console.log($.isNumeric(123));
        console.log($.isWindow(window));
    });

</script>

</body>
</html>